If you need to add a repository to download it through apt-get, edit your "/etc/apt/sources.list" file and add something like "deb repository_name" to the beginning of that file, e.g. with "sudo nano /etc/apt/sources.list".

Then do apt-get update.

i`m a big newbie to this VPS world can you please explain me in smaller details and in full codes please if you will manage to help me i will give you cookies!

like can you explain in step by step what i need to do please

As provided by pipework in the chat: http://askubuntu.com/questions/256183/how-do-you-install-java-runtime-64bit-on-12-10

You have to install the software-properties-common package to be able to use the add-apt-repository command.